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Introduction to Materials Science and Engineering
Приєднався 13 лис 2017
Відео
Ductile to Brittle Transition
Переглядів 76 тис.6 років тому
Charpy Impact Test Ductile to brittle transition temperature
Stress Concentration
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Stress concentration ahead of a crack tip Crack tip radius Distance from the crack tip
Effect of Stress and Temperature on Creep
Переглядів 39 тис.6 років тому
Effect of stress on creep Effect of stress and temperature on steady state strain rate
Creep Mechanisms
Переглядів 91 тис.6 років тому
Deformation mechanisms at high temperature Cross slip of screw dislocations Climb of an Edge Dislocation Diffusion Creep Grain Boundary sliding Deformation mechanism map
Isostress Modulus
Переглядів 15 тис.6 років тому
Young's Modulus of a composite (Isostress modulus) Isostress loading
Role of Crack Size
Переглядів 33 тис.6 років тому
Paper experiment Higher stiffness results in higher fracture stress
Griffith's Criterion
Переглядів 96 тис.6 років тому
Correction: At 13:11 I have incorrectly written surface energy as 2 a B gamma. It should be 4 a B gamma. I have detected this mistake later at 19:15 and have corrected it. So the final expression is correct.
Sub-critical Crack Growth
Переглядів 22 тис.6 років тому
Critical crack length for fast fracture Sub-critical crack growth
Age hardening II: Microstructure and mechanisms
Переглядів 76 тис.6 років тому
Age hardening II: Microstructure and mechanisms
Why is experimental CRSS less than theoretical CRSS?
Переглядів 19 тис.6 років тому
Why is experimental CRSS less than theoretical CRSS?
Such a great video on this topic.
Thanks l am ethiopian but easy understand you explan
Where can I get the balls and sticks to make models for my class?
The NaCl model shown here was part of some set purchased a long ago. Close-packed ball models can be made easily by sticking TT balls using adhesive. These do not require sticks and so are easier to make.
@@introductiontomaterialsscience ok thank you
Very well explained.
Does close packing explain the strength of metal alloys? Could close packing be used, macroscopically, to build super strong materials?
I think reverse is the case. Close-packing explains why metals deform easily. The close-packed planes act as slip plane and clos-packed direction act like slip direction.
SIR ISN'T PB-SN SYSTEM A PARTIALLY EUTECTIC SYSTEM
How do you mean by partially eutectic?
Short and crispy chapter ❤ it sir
Sir ji thanks 🙏
sir cycle me chain hi nhi h
Excellent
Huge respect sir! phenomenal work you are doing.
Sir, You are a Great Teacher. It took your just two videos to understand the whole idea of the Voids in CCP and BCC Structures. Sir is a Great Teacher. One of the Best.
17:10 23:32
Thank you so much, sir... I understand it much better now. 😌
Thank you so much Sir 🙏
Thank you so much professor 🎉❤
The best material science course on the web！！thank you
Amazing！！
Voice matches with APJ ABDUL KALAM
Was struggling to understand before. Very clear now. Thanks Sir. Sir's lectures are Best to understand. Sir has to use digital technics and speed up the lectures.
13:56 sir I donot realize the non uniqueness of slip plane for screw disloction , having many slip plane. How i imagine it in my mind real lattices?
Slip plane by definition is a plane which contains both the dislocation line vector and the Burgers vector. For screw dislocation both these vectors are along the line of the dislocation. So only one line and not a unique plane is defined by these two vectors. Thus, there are many slip planes possible in this case.
@@introductiontomaterialssciencesir, I am agree with your statement, But we know that slip plane having slip and no slip region also. If we know that above this slip region ,slip happened in atomic model of screw dislocation, then this plane is unique? Sir, I request you to explain using atomic model of screw dislocation.
Excellent description.
it is not vacancy, but the line of vancancies?
For the whole line to climb up requires a row of vacancies to be available. But in reality, the whole line will not climb up at one instant. Atoms along the line will move one by one to the neighbouring vacancies and the corresponding parts of the dislocation line will climb up.
His teaching skills are like mother feeds the small baby. Excellent and easy understand the core concept.
Super teacher and interesting in understanding 😊
the best of best I had seen from organized teaching
Sir please tell the reason why curve is like this? What phenomena dominates in all three regions?
Thank you from the heart ❤️ 🇮🇶
Greetings from Iraq ☢️
very clear! Thanks!!!
Griffith!!!!!
Thank you sir ❤
❤❤❤❤
thanks a lot sir
Nuv rasedhi niku thappa evadiki kanipistaley nidhi nuv rasukuntu potey evarikosam class chepinattu ra
I want to learn how to apply this law to data obtained by moisture absorption experiments.
Is there an example solved for fick's law? How do you calculate it for some material?
Why twinning happens
A difficult question. One can think of twinning as a plastic deformation mechanism competing with slip mechnaism. In cases where twinning requires lower stress than slip, twinning takes place. But I am aware that this is not a very satisfactory answer.
@@introductiontomaterialsscience twinning happens in pairs usually, I heard. logic behind that might help understand twinning occurrence better..
Hello Sir. Hope you are fine. I have a doubt in this lecture. At the time when temperature of the outside surface will be just above Ms, the temperature of inside will be quite higher (somewhere around nose or above nose). If the quenching of specimen is interrupted here and temp is kept constant, the curve of outside will definitely follow the non-transforming region, but the curve of inside will cross the transformation region and hence may transform into pearlite. Sir it's a request to clear this doubt because I am preparing for my exams.
What you have described is reasonable and possible.
Same rule apply to fcc can we say Nacl is not fcc??
In Nacl, corners as well as face centres are occupied by the same ion, say Cl- ion. So it is FCC. In CsCl corners are occupied by Cl- but body centres by Cs+. So it is not BCC.
So two different crystals one where Cs at corner and one in Cl at corner and arranged such a way that Cl at body centre and Cs at body centre
Very informative
👍👍👍👍
is it the potential energy of the system that is decreasing? Because according to the law of conservation of mechanical energy if an isolated system is subject only to conservative forces, then the mechanical energy is constant.
This is indeed a difficult question. Let me think about it.
No one in the world they never teach like you
👍
Finally completed Material science series for ISRO Scientist Interview Prep. ❤🎉 Great Journey by the way. Thanks professor 🔥✨
Best wishes for your interview.
If creep is considered a high temperature phenomenon, how is it a factor of glacier movement?
High or low temperature for a material is relative to its melting point. For snow even a temperature of -20 C is rather close to its meting point and so it feels hot!
In martensitic transformation the amount transformed is dependent only on temp not on time
??
1. Advantage of TTT diagram over Iron-Iron carbon diagram - Has time axis 2. Disadvantage of TTT diagram over Iron carbon diagram - TTT diagram for only single composition